Why did NPR’s Michel Martin want to talk with Dave Chappelle? It’s true that Chappelle’s Show, his sketch comedy show that ran on Comedy Central from 2003 to 2006, was one of those shows that you had to watch if you wanted to know what the culture was up to. And it’s also true that his standup specials are the kind of shows that almost feel like samizdat —-underground literature passed hand to hand in defiance of the state — even though his shows are advertised at bus stops, held in arenas and thousands of people attend....